Stalt uno maschinenfabrik



(No Model.) T Sheets-Sheet 14 F. G. SCHMIDT. AUTOMATIC SCALE.

No. 455,120. Patented June 30,1891.

(No Model.) 7 Sheets-Sheet 2. P. C. SCHMIDT. AUTOMATIC SCALE.

No. 455,120. Patented June 30,1891.

j M46. J. 7% WVz/Y" (No Model.)

' 7'S11eets-Sheet 3. F. O. SCHMIDT. AUTOMATIC SCALE.

No. 455,120. Patented June 30,1891.

4 Lb e e h S s t e e h S 7 m WA G MS H0 CH SA m T U PA a d 0 M O W No.455,120. Patented June 30,1891.

7 Sheets-Sheet 5.

(No Model.)

P. C. SCHMIDT. AUTOMATIC SCALE. No. 455,120. Patented June 30,1891.

ma Ncnms runs co., PnoTu'uYMo, WASHINGTON, a. c.

(No Model.) 7 Sheets-Sheet e.

F. O. SCHMIDT. AUTOMATIC SCALE.

No. 455,120. Patented June 30, 1891.

(-No Model.) 7 Sheets-Sheet 7.

P. O. SCHMIDT. AUTOMATIC SCALE.

No. 455,120. Patented June 30,1891.

UNITED STATES PATENT QEEIcE.

FRIEDRICH CARL SCHMIDT, OF BERLIN, ASSIGNOR TO THE MUIILENBAUAN- STALTUND MASCHINENFABRIK, VORMAIIS GEBRIIDER SEOK, OF DRES- DEN, GERMANY.

AUTOMATIC SCALE.

SPECIFICATION forming part of Letters Patent No. 455,120, dated June 30,1891. Application filed January 31, 1891. Serial No. 379,812. (Nomodel.) Patented in Germany July 23, 1890, No. I 4,889,111, 42.

T aZZ whom it may concern.-

Be it known that I, FRIEDRICH CARL SCHMIDT, of Berlin, in the Kingdom ofPrussia and German Empire, have invented a certain new and usefulImprovement in Automatic Scales, (for which I have obtained LettersPatent in Germany July 23, 1890, No. F 4,889, II, 42,) of which thefollowing is a specification, reference being had to the accompanyingdrawings and to the letters of reference marked thereon.

This invention relates to automatic scales for weighing corn, flour, andother materials; and the object of the said invention is to provide fordetermining the weight of such materials in an automatic and at the sametime continuous manner by means of an oscillating plate changing itsposition at intervals by means of the oscillating action of thescale-beam, the said oscillating plate directing the said material froma suitable hopper into the raised scale-bucket and into an auxiliaryreceptacle alternately, the material being fed into the said receptaclewhen the scale-bucket is being emptied, and the material thusaccumulated within the latter being afterward transferred to the saidscale-b ucket.

The said invention also relates to the details of constructing and thearrangement of the several parts of the said automatic scales, as

will be hereinafter more fully described.

In the accompanying drawings, Figure 1 is a vertical transverse sectionof the improved automatic scales, showing the parts in the position theyoccupy when the scale-bucket is being filled from the hopper. Fig. 2 isa similar View showingthe weights raised and the scale-bucket depressedand cut off from the hopper. Fig. 3 is a front view, partly in section,taken on the line 00 00, Fig. 4. Fig. 4

is a top View, partly in section. Fig. 5 illustrates a detail. Fig. 6 isa side View of a modified form of the automatic scales with the parts inthe same position as those shown 5 in Fig. 1. Fig. 7 is a similar viewto Fig. 6,

partly broken away and in section, but showing the parts in the sameposition as shown in Fig. 2; and Figs. 8 and 9 illustrate means used incombination with the hopper for use in weighing flour or other similaradhesive material.

The apparatus consists of a suitable framework, preferably of cast-iron,or it may be of other metal, for supporting the operating parts of theimproved automatic scales.

a is a hopper, which is to be kept filled from an ysuitable source andin any convenient and well-known manner with the corn,flour,orothermaterial to be weighed. lVhen the apparatus is started, the parts are inthe position shown in Fig. l, the weights h being depressed and thescale-bucket (I raised. \Vhile in this position the material from thehopper a will be directed into the scale-bucket d by means of a plate a,rigidly connected with the scalebeam h and being of a width of not lessthan the length of the outlet-opening of the 110pper a, Fig. 3. Thescale-bucket d is formed of the two side plates (1 and the transverseplate or plates 6 f, preferably made of sheet or cast iron and ofsuitable form or shape, the said side plates (1 being suspended by oneend of the scale-beam Z), swinging on a knife-edge in the usual andwell-known manner. The side plates (1 form the bearings for the shaft ofthe four-armed wheel 9, rotating between the said plates (1, so that twoof the four arms form with the plate 6 a closed receptacle forcollecting the material directed into the bucket by means of the plate0. 8c

c'k designate a two-armed lever pivotedto the plate 6, the short arm 5of which is designed to arrest the rotary motion of the wheel g, thelong arm It being adapted to be engaged with a part 20 of the frame torelease the said wheel 8 5 when the scale-bucket moves downward. Thematerial to be weighed will drop into the scale-bucketthat is to say,into the space formed by the plates (1 of and two of the arms quntil itsweight balances the weights h, suspended at the opposite end of thescalebeam 1), when the loaded scale-bucket d will descend until itassumes the position shown in Fig. 2. At the same time the plate 0,rigidly connected with the scale-beam h, par- I takes in the swingingmovement of the latter, and the end thereof passes across theoutlet-opening of the hopper a, so that the current of material flowingfrom the latter will now be directed into an auxiliary receptacle 1),arranged between the shoulders 0 0. The lowermost walln of the saidauxiliary receptacle is pivotally connected with the frame, so as toform a fiap or door adjacent to the upper part of the scale-bucket. Thesaid flap n is provided with a rearward extension, which is acted uponby an elbow-lever Z, pivoted to the rear part of the receptacle 1) andprovided with a counter-weight Z, the lower end of which is formedeccentrieally, the said elbow-lever being operated by the swingingscale-beam Z).

lVhile the material is entering the auxil iary receptacle 1) thescale-bucket (Z is emptied automatically in the following manner:Rigidly connected with the frame-shaped scale-beam]; is a pipe q, Figs.8, 4, and 5, arranged on the outside of the supports 0 of the beam Z),so as to swing freely with the latter, the said pipe q being so arrangedthat it intersects the horizontal plane of the scale-beam in thedirection of that end of the latter which carries the scale-bucket (Z,or, in other words, that it is inclined toward the scale-beam end. Thedegree of inclination (or,in other words the angle) formed by thelongitudinal axis of the pipe q and the plane of the scale-beam Z) maybe increased or diminished at will by the setscrews 7" and s, Fig. 5, bymeans of which the fastening-lug t of the pipe q is secured to thescale-beam b. The screw .9 clamps the edges of a longitudinal slot inthe lug If, so as to allow the pipe to be raised or lowered, as desired.The pipe (1 contains a relatively heavy ball or other rolling bodyP,preferably of cast-iron, which, when th scale exactly balances, asshown in Fig. 2, wi 1 move in the direction of the scale-bucket (Z andby reason of its gravity cause the said filled bucket (Z to descend fora farther distance. By this means the arm 7; of the two-armed lever willbe arrested by the part to of the frame of the machine and will beturned on its pivot, so that the short arm 1; will slip from under thearrested arm of the wheel 9 and will set the same free. The said armwill under the weight of the material collected in the scalebucket benow pushed outward and the material discharged. The emptied scale-bucketcZ will now rise again and the two-armed lever '1' 7o reassume itsnormal position, so that the next arm of the wheel rotated by thepressure of the moving material, will strike against the projecting armZ and be held by the same to close the bucket (Z, while the next arm nowtakes the place of the bottom blade and partly closes the upper side ofthe said bucket. The scale-bucket (Z being thus emptied, the end of thescale-beam Z) carrying the weights 2, will descend, and a projection 10,secured to or forming part of the said weighted end of the scale-beam,will press down the end of the lever Z, and by reason of theeccentricity of the counter-weight the pressure heretofore exerted uponthe said extension will be relieved and the flap n will be free to openunder the weight of the material collected within the said auxiliaryreceptacle 1], Fig. l. The said material will therefore flow into theraised scale bucket (Z. On the descent of the weighted end of thescale-beam b the oscillating plate 0' will be moved back into itsoriginal position and will direct the stream of the material into thebucket (Z and break the connection between the hopper and the auxiliaryreceptacle 1), and in this manner the said bucket will again be filled,as hereinbetore described.

In the modification shown in Figs. 6 and 7 of the drawings theoscillating plate 0 is not secured to the scale-beam Z) itself, but ispivotally connected with the stationary auxiliary receptacle 1), and itis operated from the said beam by means of the lever-arm Z) and theconnecting-rod b between the beam b and the plate 0. The scale-beam b inthis modification acts upon the two-armed lever to Z by striking thesaid arm a on the descent of the weights and relieving the same on thedescent of the filled scale-bucket (Z. The lever-arm Z is made heavierthan the arm a and bears against an eccentric projection or cam n on therear side of the pivotally-suspended flap n of the auxiliary receptacle1), thus positively closing the said flap on the descent of thescale-bucket end of the beam Z) and allowing the said flap n to openunder the action of its counter-weight n on the descent of the weightedend of the said beam.

1 provide for arresting the scale-bucket (Z after the same has beenemptied automatically. In order to save room in large scales, the wheelmay be omitted and be replaced by a flap or door F, oscillating on anaxis journaled in bearings secured to the said scale. The said flap ordoor is kept closed by a hooked lever G, which, as in the form ormodification hereinbefore described with reference to the lever Z 7c, ispivoted to the body of the scale, and by the said lever striking againsta fixed rest to the said flap or door is opened on the descent of thescale-bucket, thus disengaging from the end of the flap F the hooked endof the lever and allowing the said flap to open under the weight of thecollected material. The flap or door F in opening will turn a cam E,rigidly secured to its oscillating shaft, and the said cam, acting uponthe projecting portion of a locking-bolt B, will push or move the latterin the direction of the scale-bucket. The forward end of the bolt Brests in a slot in a sleeve D, secured to or forming part of the rod orbar (Z by which the scale-bucket (Z is suspended, the said sleeve Dsliding on a bolt-like extension 0 of a fixed standard T. The parts areso arranged that the hook of the lever G Will be withdrawn from the flapor door F after the sleeve D, descending with the bucket (Z, has

slid down on the bolt 0, so that the lockingbolt B Will be opposite anopening provided near the upper end of the said standard-bolt O andenter the latter when the said bolt 0 is pushed forward by the cam E onthe oscillating shaft of the flap or door F. By this means thescale-bucket d is coupled for a short space of time with the fiXedstandard T and retained in position until the material weighed has beendischarged, when the flap or doorF will close again under the action ofits counter-weight I and through its oscillating shaft, and the cam E,afiixed thereto, will withdraw the locking-bolt B from the opening inthe standard-bolt C, so that the scale-bucket is free to rise, the flapor door having been secured by the hook of the lever G.

In cases Where these improved automatic scales are intended for use inweighing ground materials-such as flour, which is liable to stick inthevoutlet-opening of the hopper a and close it up-the said hopper isprovided with a device for positively feeding the said material throughthe said opening. This device is illustrated in Figs. 8 and 9 of thedrawings, and consists in a rotary drum H, secured to a shaft W,receiving its rotary motion from belt-pulleys. (Not shown in thedrawings.) The said drum His provided with the blades H, forcing theflour or other material in the direction of the opening of the hopper a,which just above the said opening is provided with a number of fixedscrapers I, between which the blades H pass, so as to be freed fromflour. The flour is thus compelled to fall back and drop through theoutlet-opening of the hopper, as will be readily understood from thedrawings.

Having fully described my invention, what I desire to claim and secureby Letters Patent is 1. In automatic scales, an oscillating platearranged below the outlet-opening of a receiving-hopper and movedalternately in the direction of the weighted end and in the direction ofthe scale-bucket end of the scalebeam by the pendulations of the latter,so that the material to be weighed will be conducted alternately intothe scale-bucket direct and into an auxiliary collecting-receptacle.

2. In an automatic scale, the combination of a receiving-hopper, anoscillating scalebeam provided with an attached plate which oscillatestherewith, a scale-bucket suspended by the scale-beam, an auxiliaryreceptacle provided at its bottom with a pivoted plate for the purposeof placing'such receptacle in communication with the scale-bucket, andan automatically-operated lever for actuating the pivoted plate toconduct the material from the auxi lia'ry receptacle into thescale-bucket, substantially as described.

3. In automatic scales, the combination of the receiving-hopper a, anoscillating plate 0,

connected with the scale-beam Z) and partaking in the movements of thelatter, a receptacle p, the balance-scale (Z, suspended at one end ofthe beam 1;, and the pipe q, having the rolling body P, substantially asand for the purpose specified.

4. In automatic scales, an auxiliary receptacle 1), arranged above thescale-bucket and having that wall which is adjacent to the bucketconstructed to form a flap or door or, which is closed by a lever whenthe scalebeam oscillatesin the direction of the bucket end, and on thereturn movement the said beam acts upon the said lever to allow the flapto open under the pressure of the collected material, substantially asand for the purpose specified.

5. In an automatic scale, the combination. of a receiver-hopper, anoscillating scale-beam having a rigidly-attached plate oscillatingtherewith, a scale-bucket suspended by the scale-beam and provided atits bottom with a flap or door normally retained in a closed position,and an auxiliary receptacle interposed between the scale-bucket and thereceiving hopper and provided with an opening and closing flap fordelivering the material into the bucket, substantially as described.

6. In automatic scales, means for temporarily locking in position thedescended scalebucket during and for a short time after the discharge ofthe material, consisting of the sliding bolt B, which, by means of a camE, secured to the rocking shaft of the flap or door F of the descendedscale d, is pushed into a stationary bolt 0, thus coupling the latterwith the sleeve D of the bucket, substantially as and for the purposespecified.

7. In automatic scales, the combination of a receiving-hopper a,scrapers I near the outlet-opening of the same, a rotary shaft arrangedabove the said outlet-opening and having the blades II, an oscillatingplate 0, moving below the said outlet-opening in conformity with themovements of the scale-beam Z), and a scale-bucket carried by thelatter, substantially as and for the purposes specified.

8. In an automatic scale, the combination, with the scale-beam andscale-bucket suspended thereby, of the pipe q, rigidly secured to andoscillating in unison with the scalebeam, and a rolling body within therigidlyattached pipe, substantially as described.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

FRIEDRICH CARL SCHMIDT.

Witnesses:

MORITZ FAUST, ALFRED SOHALLER.

